Page 1705 of 2889

(c) Install springs and struts in hub (Fig. 81).
Use lots of petroleum jelly to hold them in place.
Then compress struts with your fingers and move
sleeve upward until struts are started in sleeve.
Verify that struts are engaged in sleeve before pro-
ceeding.
(d) Turn synchro assembly upright. Then move
sleeve into neutral position on hub and work struts
into sleeve at same time. Be sure struts are seated
and springs are not displaced during assembly.(6) Install first gear stop ring in 1-2 synchro hub
and sleeve (Fig. 82). Verify stop ring is seated and
engaged in hub and sleeve.
(7) Install 1-2 synchro assembly and stop ring on
mainshaft with the taper on the sleeve facing for-
ward. (Fig. 83).
(8) Install snap ring that secures 1-2 synchro on
mainshaft hub (Fig. 84). Verify snap ring is seated in
groove in mainshaft hub.
(9) Assemble second gear clutch cone, clutch ring
and stop ring (Fig. 85).
Fig. 80 1-2 Synchro Sleeve On Hub
1 - ALIGN WIDE SLOT IN SLEEVE WITH WIDE SPLINE OF HUB
2 - 1-2 SLEEVE AND HUB
Fig. 81 1-2 Synchro Struts And Springs
1 - WOOD BLOCKS
2 - HUB
3 - SLEEVE
4 - STRUTS AND SPRINGS (4 EACH)
Fig. 82 First Gear Stop Ring In Synchro Hub
Fig. 83 1-2 Synchro
1 - MAINSHAFT HUB
2 - 1-2 SYNCHRO ASSEMBLY
3 - TAPERED SIDE OF SLEEVE
21 - 70 MANUAL - NV4500BR/BE
MANUAL - NV4500 (Continued)
Page 1706 of 2889
(10) Install assembled second gear clutch cone and
rings on mainshaft and in 1-2 synchro hub (Fig. 86).
(11) Install snap ring that secures second gear
clutch cone on mainshaft (Fig. 87). Use narrow blade
screwdriver to work snap ring into hub groove as
shown. Verify snap ring is seated in mainshaft
groove.NOTE: If snap ring will not fit in groove, clutch cone
is slightly misaligned.
Fig. 84 1-2 Synchro Snap Ring
1 - SYNCHRO SNAP RING
2 - 1-2 SYNCHRO ASSEMBLY
3 - MAINSHAFT HUB
Fig. 85 Second Gear Clutch Cone, Clutch Ring And
Stop Ring
1 - STOP RING
2 - CLUTCH RING
3 - CLUTCH CONE
Fig. 86 Second Gear Clutch Cone, Clutch Ring And
Stop Ring
1 - CLUTCH CONE
2 - STOP RING
3 - CLUTCH RING
Fig. 87 Second Gear Clutch Cone Snap Ring
1 - SCREWDRIVER
2 - MAINSHAFT HUB
3 - SNAP RING
4 - SECOND GEAR CLUTCH CONE
BR/BEMANUAL - NV4500 21 - 71
MANUAL - NV4500 (Continued)
Page 1707 of 2889

(12) Install second gear bearing on mainshaft (Fig.
88).
(13) Install second gear on mainshaft and bearing.
Rotate gear until tabs of second gear clutch ring are
seated in tab slots in gear (Fig. 89).
(14) Install thrust washer pin in shaft (Fig. 90).
(15) Install second gear thrust washer. Verify
washer is seated on gear and pin (Fig. 91).
(16) Install second gear thrust washer snap ring
(Fig. 92). Verify snap ring is seated in mainshaft
groove.
(17) Install third gear bearing spacer on shaft and
seat it against thrust washer snap ring (Fig. 92).
(18) Install third gear bearing on mainshaft (Fig.
93). Bearing should be flush with mainshaft hub.NOTE: If bearing is not flush with hub, the bearing
spacer or snap ring was not installed.
(19) Install third gear over bearing and onto main-
shaft (Fig. 94).
(20) Install synchro stop ring on third gear (Fig.
95). Verify stop ring is seated on cone taper.
(21) If 3-4 synchro was disassembled for service,
reassemble synchro components as follows:
(a) Align and install synchro sleeve on hub (Fig.
96).Front side of hub has a narrow groove
machined in it.
(b) Insert all three synchro struts in slots
machined in sleeve and hub (Fig. 96).
(c) Install and seat synchro springs (Fig. 96).
Use flat blade or Phillips screwdriver to compress
springs and seat them in struts and hub as shown.
Fig. 88 Second Gear Bearing
1 - SECOND GEAR BEARING
Fig. 89 Second Gear
1 - SECOND GEAR
2 - CLUTCH RING TABS
3 - TAB SLOTS (IN GEAR)
Fig. 90 Thrust Washer Pin
1 - THRUST WASHER PIN
2 - SECOND GEAR
Fig. 91 Second Gear Thrust Washer
1 - SECOND GEAR
2 - SECOND GEAR THRUST WASHER
3 - LOCATING PIN IN WASHER NOTCH
21 - 72 MANUAL - NV4500BR/BE
MANUAL - NV4500 (Continued)
Page 1708 of 2889

(22) Start 3-4 synchro assembly on mainshaft with
the hub groove and sleeve groove both facing for-
ward. Tap assembly onto shaft splines until hub is
about 3 mm (0.125 in.) away from third gear stop
ring. Then align stop ring with synchro sleeve and
hub and seat synchro assembly with Installer C-4040
(Fig. 97).
(23) Verify 3-4 synchro hub is seated on shaft with
approximately 3 mm (0.125 in.) of shaft spline visi-
ble.
NOTE: If hub is not seated, stop ring lugs are mis-
aligned. Rotate ring until lugs are engaged in 3-4
hub slots.
(24) Verify that second and third gear rotate freely
at this point. If not, determine the cause and correct.
(25) Invert mainshaft in case or bench.
Fig. 92 Snap Ring And Third
1 - SECOND GEAR THRUST WASHER
2 - THRUST WASHER SNAP RING
3 - THIRD GEAR BEARING SPACER
Fig. 93 Third Gear Bearing
1 - THIRD GEAR BEARING
Fig. 94 Third Gear
1 - THIRD GEAR
Fig. 95 Third Gear Stop Ring
1 - SYNCHRO STOP RING
2 - THIRD GEAR
Fig. 96 Synchro Assembly (3-4)
1 - STRUT (3)
2 - SPRING (3)
3 - 3-4 SLEEVE
4 - 3-4 HUB
BR/BEMANUAL - NV4500 21 - 73
MANUAL - NV4500 (Continued)
Page 1709 of 2889

(26) Install first gear bearing on mainshaft.
(27) Install first gear on shaft with clutch hub side
of gear facing the front of shaft (Fig. 98). Verify tabs
on clutch ring are aligned and seated in first gear
hub.
NOTE: 1-2 synchro hub will not seat properly if
clutch ring tabs are misaligned.
(28) Install reverse clutch gear on first gear (Fig.
98). Verify clutch gear is seated on shaft splines.
(29) Install reverse clutch gear snap ring with
heavy duty snap ring pliers (Fig. 98). Verify snap
ring is seated in groove.
NOTE: Reverse gear will not fit properly if snap ring
is not seated.(30) Install stop ring on clutch cone (Fig. 99). Ver-
ify stop ring is seated on cone taper.
(31) Install reverse gear bearing spacer on main-
shaft and seat against reverse clutch gear snap ring
(Fig. 100).
(32) Install reverse gear bearing on mainshaft
(Fig. 100).
(33) If reverse gear sleeve and struts were disas-
sembled for service, reassemble sleeve, struts and
springs as follows:
CAUTION: The reverse sleeve will fit either way on
the hub. Verify tapered side of the sleeve faces
rearward.
(a) Position sleeve on hub so tapered side of
sleeve faces rearward. (Fig. 101).
(b) Rotate sleeve to align teeth on sleeve and
hub. Sleeve will slide easily into place on hub when
properly aligned.
Fig. 97 Seating 3-4 Synchro Assembly On Mainshaft
1 - 3-4 SYNCHRO HUB
2 - HUB GROOVE
3 - INSTALLER C-4040
Fig. 98 First Gear And Clutch Gear
1 - FIRST GEAR
2 - REVERSE CLUTCH GEAR SNAP RING
3 - REVERSE CLUTCH GEAR
Fig. 99 Clutch Gear Stop Ring
1 - REVERSE GEAR STOP RING
2 - CLUTCH GEAR
3 - FIRST GEAR
Fig. 100 Reverse Gear Bearing And Spacer
1 - REVERSE GEAR BEARING
2 - BEARING SPACER
3 - FIRST GEAR
21 - 74 MANUAL - NV4500BR/BE
MANUAL - NV4500 (Continued)
Page 1710 of 2889

(c) Install springs in gear hub (Fig. 101). Use
petroleum jelly to hold springs in place if desired.
(d) Compress first spring with flat blade screw-
driver and slide strut into position in hub slot.
Then work spring into seat in strut with small
hooked tool or screwdriver.
(e) Install second and third struts in same man-
ner as described in step (d).
(f) Work sleeve upward on hub until struts are
centered and seated in sleeve. Sleeve should be in
neutral position after seating struts.
(34) Install reverse gear and synchro assembly on
mainshaft (Fig. 102). Rotate assembly until stop ring
lugs engage in hub slots and gear drops into seated
position.
(35) Install reverse gear thrust washer (Fig. 103).
(36) Install rear bearing on mainshaft with
Installer 6446. Seat bearing on output shaft and
against thrust washer (Fig. 104).
Fig. 101 Reverse Gear Synchro Assembly
1 - REVERSE GEAR
2 - SLEEVE
3 - SPRING (3)
4 - STRUT (3)
5 - HUB
Fig. 102 Reverse Gear
1 - REVERSE GEAR AND SYNCHRO ASSEMBLY
Fig. 103 Reverse Gear Thrust Washer
1 - THRUST WASHER
2 - REVERSE GEAR
Fig. 104 Mainshaft Rear Bearing
1 - INSTALLER 6446
2 - MAINSHAFT REAR BEARING
BR/BEMANUAL - NV4500 21 - 75
MANUAL - NV4500 (Continued)
Page 1711 of 2889

(37) Install fourth gear stop ring in 3-4 synchro
sleeve (Fig. 105).
(38) Install fourth gear clutch gear in stop ring
(Fig. 106).
(39) Roll gear case onto its left side.
(40) Grip mainshaft at pilot bearing hub and just
behind reverse gear. Then lift assembly and guide
rear of shaft through bearing bore at rear of case.
(41) Continue holding front of shaft but switch
grip at rear to shaft output splines. Lift mainshaft
assembly slightly, align gears and seat assembly in
case.
(42) Set transmission case upright (Fig. 107).
(43) Install drive gear thrust bearing on mainshaft
(Fig. 108). Use plenty of petroleum jelly to hold bear-
ing in place.
(44) Check alignment and mesh of mainshaft
gears. If gears are not aligned, roll case on side and
realign shaft and gears in case.DRIVE GEAR AND RETAINER
(1) Install bearing on drive gear with Installer
6448 (Fig. 109).
(2) Lubricate pilot bearing with petroleum jelly
and install it in drive gear bore.
(3) Install drive gear on mainshaft. Work gear
rearward until mainshaft hub is seated in pilot bear-
ing.
(4) Install bearing cup in front retainer with Han-
dle C-4171 and Installer C-4308 (Fig. 110).
(5) Install new oil seal in front bearing retainer
with Installer 6052 (Fig. 111). Use one or two wood
blocks to support retainer as shown. Lubricate seal
lip with petroleum jelly after installation.
(6) Clean contact surfaces of gear case and front
bearing retainer with a wax and grease remover.
Fig. 105 Fourth gear Stop Ring
1 - 3-4 SYNCHRO SLEEVE
2 - FOURTH SPEED STOP RING
Fig. 106 Fourth gear Clutch Gear
1 - FOURTH SPEED CLUTCH GEAR
Fig. 107 Mainshaft And Geartrain In Case
1 - MAINSHAFT AND GEARTRAIN ASSEMBLY
2 - FOURTH SPEED CLUTCH GEAR
Fig. 108 Drive Gear Thrust Bearing
1 - MAINSHAFT
2 - DRIVE GEAR THRUST BEARING
21 - 76 MANUAL - NV4500BR/BE
MANUAL - NV4500 (Continued)
Page 1712 of 2889
(7) Apply MopartSilicone Sealer or equivalent to
flange surface of front bearing retainer (Fig. 112).
(8) Install front bearing retainer over drive gear
and start it into case.
(9) Start front bearing retainer in gear case. Verify
retainer lube channel is at the top-center(12
O'clock)position (Fig. 112).(10) Align front bearing retainer bolt holes and tap
retainer into place with plastic mallet. Installnew
retainer bolts and tighten to 30 N´m (22 ft. lbs.) (Fig.
113).
NOTE: Never reuse the old bolts.
Fig. 109 Front Bearing On Drive Gear
1 - INSTALLER 6448
2 - BEARING
3 - DRIVE GEAR
Fig. 110 Front Bearing Cup In Retainer
1 - INSTALLER C-4308
2 - HANDLE C-4171
3 - WOOD BLOCKS
4 - RETAINER
Fig. 111 Bearing Retainer Oil Seal
1 - INSTALLER 6052
2 - RETAINER
3 - WOOD BLOCK
Fig. 112 Location Of Front Retainer Lube Channel
1 - LUBE CHANNEL
2 - FRONT RETAINER
3 - APPLY GASKET MAKER HERE
BR/BEMANUAL - NV4500 21 - 77
MANUAL - NV4500 (Continued)